Buggy code:
public final class JenkinsJobManagement extends AbstractJobManagement { private static final Logger LOGGER = Logger . getLogger ( JenkinsJobManagement . class . getName ( ) ) ; private final EnvVars envVars ; private final AbstractBuild < ? , ? > build ; private final LookupStrategy lookupStrategy ; private final Map < Item , DslEnvironment > environments = new HashMap < Item , DslEnvironment > ( ) ; public JenkinsJobManagement ( PrintStream outputLogger , EnvVars envVars , AbstractBuild < ? , ? > build , LookupStrategy lookupStrategy ) { } public JenkinsJobManagement ( PrintStream outputLogger , EnvVars envVars , AbstractBuild < ? , ? > build ) { } @ Override public String getConfig ( String path ) throws JobConfigurationNotFoundException { } @ Override public boolean createOrUpdateConfig ( Item dslItem , boolean ignoreExisting ) throws NameNotProvidedException { } @ Override public void createOrUpdateView ( String path , String config , boolean ignoreExisting ) { } @ Override public String createOrUpdateConfigFile ( ConfigFile configFile , boolean ignoreExisting ) { } @ Override public void createOrUpdateUserContent ( UserContent userContent , boolean ignoreExisting ) { } @ Override public Map < String , String > getParameters ( ) { } @ Override public String getCredentialsId ( String credentialsDescription ) { } @ Override public void queueJob ( String path ) throws NameNotProvidedException { } @ Override public InputStream streamFileInWorkspace ( String relLocation ) throws IOException { } @ Override public String readFileInWorkspace ( String relLocation ) throws IOException { } @ Override public String readFileInWorkspace ( String jobName , String relLocation ) throws IOException { } @ Override public void requirePlugin ( String pluginShortName ) { } @ Override public void requireMinimumPluginVersion ( String pluginShortName , String version ) { } @ Override public void requireMinimumCoreVersion ( String version ) { } @ Override public VersionNumber getPluginVersion ( String pluginShortName ) { } @ Override public VersionNumber getJenkinsVersion ( ) { } @ Override public Integer getVSphereCloudHash ( String name ) { } @ Override public String getConfigFileId ( ConfigFileType type , String name ) { } @ Override public void renameJobMatching ( final String previousNames , String destination ) throws IOException { } @ Override public Set < String > getPermissions ( String descriptorId ) { } @ Override public Node callExtension ( String name , Item item , Class < ? extends ExtensibleContext > contextType , Object ... args ) { } private void markBuildAsUnstable ( String message ) { } private FilePath locateValidFileInWorkspace ( FilePath workspace , String relLocation ) throws IOException { } private String lookupJob ( String path ) throws IOException { } private boolean updateExistingItem ( AbstractItem item , Item dslItem ) { String config = dslItem . getXml ( ) ; boolean created ; Diff diff ; try { String oldJob = item . getConfigFile ( ) . asString ( ) ; diff = XMLUnit . compareXML ( oldJob , config ) ; <START_BUG> if ( diff . similar ( ) ) { <END_BUG> JenkinsJobManagement . LOGGER . log ( Level . FINE , String . format ( "Item<seq2seq4repair_space>%s<seq2seq4repair_space>is<seq2seq4repair_space>identical" , item . getName ( ) ) ) ; notifyItemUpdated ( item , dslItem ) ; return false ; } } catch ( Exception e ) { JenkinsJobManagement . LOGGER . warning ( e . getMessage ( ) ) ; } JenkinsJobManagement . LOGGER . log ( Level . FINE , String . format ( "Updating<seq2seq4repair_space>item<seq2seq4repair_space>%s<seq2seq4repair_space>as<seq2seq4repair_space>%s" , item . getName ( ) , config ) ) ; Source streamSource = new StreamSource ( new StringReader ( config ) ) ; try { item . updateByXml ( streamSource ) ; notifyItemUpdated ( item , dslItem ) ; created = true ; } catch ( IOException e ) { JenkinsJobManagement . LOGGER . log ( Level . WARNING , "Error<seq2seq4repair_space>writing<seq2seq4repair_space>updated<seq2seq4repair_space>item<seq2seq4repair_space>to<seq2seq4repair_space>file." , e ) ; created = false ; } return created ; } private boolean createNewItem ( String path , Item dslItem ) { } private void notifyItemCreated ( hudson . model . Item item , Item dslItem ) { } private void notifyItemUpdated ( hudson . model . Item item , Item dslItem ) { } private DslEnvironment getSession ( Item item ) { } private void renameJob ( Job from , String to ) throws IOException { } @ SuppressWarnings ( "unchecked" ) private static < I extends AbstractItem & TopLevelItem > I move ( hudson . model . Item item , DirectlyModifiableTopLevelItemGroup destination ) throws IOException { } }

Fix:
if ( diff . identical ( ) ) {